Servomotor systems without provision for follow-up action; Circuits therefor

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F15Hydraulics devices F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL FLUID-PRESSURE ACTUATORS

F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor

F15B11/003Systems with load-holding valves F15B11/006Hydraulic "Wheatstone bridge" circuits F15B11/02Systems ess entially incorporating special features for controlling the speed or actuating force of an output member F15B11/022in which a rapid approach stroke is followed by a slower, high-force working stroke F15B11/024by means of differential connection of the servomotor lines F15B11/028for controlling the actuating force F15B11/032by means of fluid-pressure converters F15B11/0325the fluid-pressure converter increasing the working force after an approach stroke F15B11/036by means of servomotors having a plurality of working chambers F15B11/0365Tandem constructions F15B11/04for controlling the speed F15B11/0406during starting or stopping F15B11/0413in one direction only, with no control in the reverse direction F15B11/042by regulating means in feed line F15B11/0423by controlling pump output or bypass, other than to maintain constant speed F15B11/0426by controlling the number of pumps or parallel valves switched on F15B11/044by regulating means in return line F15B11/0445with counterbalance valves F15B11/046depending on the position of the working member F15B11/048with deceleration control F15B11/05specially adapted to maintain constant speed F15B11/055by adjusting the pump output or bypass F15B11/06involving features specific to the use of a compressible medium F15B11/064with devices for saving the compressible medium F15B11/068with valves for gradually putting pneumatic systems under pressure F15B11/072Combined pneumatic-hydraulic systems F15B11/0725with the driving energy being derived from a pneumatic system, a subsequent hydraulic system displacing or controlling the output element F15B11/076with pneumatic drive or displacement and speed control or stopping by hydraulic braking F15B11/08with only one servomotor F15B11/10in which the servomotor position is a function of the pressure also pressure regulators as operating means for such systems, the device itself may be a position indicating system F15B11/12providing distinct intermediate positions with step-by-step action with a number of pistons in a single cylinder step-by-step action obtained by combining two or more servomotors F15B11/18 F15B11/121providing distinct intermediate positions F15B11/122by means of actuators with multiple stops F15B11/123by means of actuators with fluid-operated stops F15B11/125by means of digital actuators F15B11/126by means of actuators of the standard type with special circuit controlling means F15B11/127with step-by-step action F15B11/128by means of actuators of the standard type with special circuit controlling means F15B11/13using separate dosing chambers of predetermined volume F15B11/15with special provision for automatic return F15B11/16with two or more servomotors F15B11/161with sensing of servomotor demand or load F15B11/162for giving priority to particular servomotors or users F15B11/163for sharing the pump output equally amongst users or groups of users F15B11/165for adjusting the pump output or bypass in response to demand F15B11/166Controlling a pilot pressure in response to the load F15B11/167using pilot pressure to sense the demand F15B11/168with an isolator valve (duplicating valve) F15B11/17using two or more pumps F15B11/18used in combination for obtaining stepwise operation of a single controlled member F15B11/183Linear stepwise operation F15B11/186Rotary stepwise operation F15B11/20controlling several interacting or sequentially-operating members F15B11/205the position of the actuator controlling the fluid flow to the subsequent actuator F15B11/22Synchronisation of the movement of two or more servomotors